how does the letter from raskolnikov's mother reflect the same attitudes that marmeladov has expressed?

Marmeladov's daughter has been forced to prostitute herself in order to save her family. This same attitude of sacrifice is also mentioned in Raskolnikov's mother's letter when she reminds him that his sister's job as a maid has ruined her reputation after improper advances are made by her employer (his sister was forced to work to help pay his rent). Both of these girl's have been forced to sacrifice their innocence and reputations to financially keep the "men" in their families afloat.

Marmeladov is a titular councillor and a drunkard. He appears early in the novel to drunkenly bemoan his life and extol his suffering to Raskolnikov in a tavern. Marmeladov is consumed with making money at any price and is rather callous about people's individual feelings. Similarly Raskolnikov's mother writes about "good news". THis news involves the utter humiliation of his sister culminating in marriage to a man she didn't really love. THe upside, according to her, was that he is well to do.